TY - GEN
T1 - Streamlining of bridge pier as a scour countermeasure
T2 - International Foundations Congress and Equipment Expo 2015, IFCEE 2015
AU - Li, Junhong
AU - Tao, Junliang
AU - Yu, Xiong Bill
N1 - Publisher Copyright:
© ASCE 2015.
PY - 2015
Y1 - 2015
N2 - Scour around bridge pier is known as one of the most critical causes to bridge failure. Countermeasures suggested by HEC-23 (2009) include riprap, gabions, spurs, guide banks, and so on. The principals of these countermeasures are either mechanically stabilizing the channel bed surface to prevent the development of the scour hole, or reducing the vortex intensity. Streamlining of the piers is a potentially feasible countermeasure to bridge scour by reducing the vortex strength. In this paper, Computational Fluid Dynamics (CFD) models are developed to evaluate the feasibility of streamlining as a countermeasure. Five test cases with different streamlining features are systematically analyzed and compared. It is found that the vertical profile of the pier nose and sidewalls has significant effects on the development of vortex structures around piers. Streamlined pier nose and sidewalls help reduce the downward flow in front of the piers, the vortex extent around the pier and the bed shear stress intensity. If the pier is not aligned with the incoming flow, however, the effectiveness of streamlining as a scour countermeasure may be highly compromised.
AB - Scour around bridge pier is known as one of the most critical causes to bridge failure. Countermeasures suggested by HEC-23 (2009) include riprap, gabions, spurs, guide banks, and so on. The principals of these countermeasures are either mechanically stabilizing the channel bed surface to prevent the development of the scour hole, or reducing the vortex intensity. Streamlining of the piers is a potentially feasible countermeasure to bridge scour by reducing the vortex strength. In this paper, Computational Fluid Dynamics (CFD) models are developed to evaluate the feasibility of streamlining as a countermeasure. Five test cases with different streamlining features are systematically analyzed and compared. It is found that the vertical profile of the pier nose and sidewalls has significant effects on the development of vortex structures around piers. Streamlined pier nose and sidewalls help reduce the downward flow in front of the piers, the vortex extent around the pier and the bed shear stress intensity. If the pier is not aligned with the incoming flow, however, the effectiveness of streamlining as a scour countermeasure may be highly compromised.
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U2 - 10.1061/9780784479087.032
DO - 10.1061/9780784479087.032
M3 - Conference contribution
AN - SCOPUS:84925111268
T3 - Geotechnical Special Publication
SP - 319
EP - 329
BT - IFCEE 2015 - Proceedings of the International Foundations Congress and Equipment Expo 2015
A2 - Anderson, J. Brian
A2 - Iskander, Magued
A2 - Suleiman, Muhannad T.
A2 - Laefer, Debra F.
PB - American Society of Civil Engineers (ASCE)
Y2 - 17 March 2015 through 21 March 2015
ER -